I don't know where you found this information
Zinc has a relatively low thermal conductivity. You'd be WAY much better making a #rotor block in al, both in terms of price, performance and ease.
Thermal conductivites:
http://www.ai.mit.edu/people/tk/tks/tcon.html
Thermal Conductivity, W/cm-K
Copper 3.937
Zinc 1.024
Brass 70% copper, 30% zinc 1.220
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